I was wondering how you got stack_size for the loot chests. I have been struggling with how to know an item has stack_size in game.item_prototypes, outside of just knowing in advance. If one tries to access a nil value you get an error and the current game quits to the main menu. I have a way of tracking stack_size and if any other value exists from data-final-fixes to during-the-game , but it's definitely not the right way.

I took a look at your code but I'm having a hard time following where the stack_size is coming from.

This should work, modified from my code

local local_get_stack_size = function(name)
if data.raw["item"][name] ~= nil then
local stack_size = data.raw["item"][name].stack_size
if stack_size ~= nil then return stack_size end
end
return 50 --make something up
end

in game you can use game.item_prototypes[name] I guess

Other than that loop though all the item groups check name and stack_size if both valid record in a table for later use.

Yeah, during the game is where I am having trouble... I tried recording data during data-final-fixes but maybe I was doing it wrong, because I couldn't access any later.

So replace data.raw with game.item_prototypes should work

If you even READ a nil, it throws an error and exits to the main menu. They removed iterator functions, so you can't check the keys/values. There's a way around it, and I'm not going to tell them. They'll figure it out eventually.

???.. yep there is always a way. I was getting nil recipes wich was doing somthing like that because of commas at the end of tabe entries. guess one other thing you could do is wrap it in a pcall and hope to catch the exception. But anyway ill see what you've done later on to remedy it.